Association of cystatin C with ischemia in patients with coronary heart disease.

Deo R, Shlipak MG, Ix JH, Ali S, Schiller NB, Whooley MA. Association of cystatin C with ischemia in patients with coronary heart disease. Clinical Cardiology. 2009 Nov 1; 32(11):E18-22.

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Abstract:

BACKGROUND: Elevated concentrations of cystatin C are associated with greater cardiovascular morbidity and mortality. We sought to determine whether elevated concentrations of cystatin C were associated with inducible ischemia in patients with coronary heart disease (CHD). METHODS: We measured serum cystatin C and performed exercise treadmill testing with stress echocardiography in a cross-sectional study of 899 outpatients with CHD. RESULTS: Among the 241 participants in the highest quartile of cystatin C ( > 1.30 mg/L), 38% had inducible ischemia, compared with 13% of those in the lowest quartile of cystatin C < 0.92 mg/L; adjusted odds ratio [OR]: 2.1; 95% confidence interval [CI]: 1.2 to 3.8; p = 0.01). However, this association differed in participants with and without a history of coronary artery bypass graft (CABG), as well as in users and nonusers of beta-blockers and statins (p values for interaction < 0.1). Among participants without a history of CABG, 35% of those in the highest quartile and 9% of those in the lowest quartile of cystatin C had inducible ischemia (adjusted OR: 3.05; 95% CI: 1.3-6.9; p = 0.008). Among participants who were not using beta-blockers, 44% of those in the highest quartile and 7% in the lowest quartile of cystatin C had inducible ischemia (adjusted OR: 5.3; 95% CI: 1.8-15.5; p = 0.002). Among participants who were not using statins, 39% of participants in the highest quartile and 4% of those in the lowest quartile had inducible ischemia (adjusted OR: 10.3; 95% CI: 2.5-43.3; p = 0.001). CONCLUSIONS: Elevated levels of cystatin C are independently associated with inducible ischemia among outpatients with stable coronary disease.